New K–Ar biotite and amphibole ages of granitoids of Sikhote-Alin (Russian Far East): Criteria of reliability and interpretation

Metallogenic Evolution of Northeast Asia Related to the Cretaceous Turn of Geological Evolution

“…Both intrusions are composed of medium-grained biotite-hornblende adakitic granitoids with numerous inclusions of fine-grained diorite ranging from 5 to 20 cm in size. The age of adakites, according to the results of Rb-Sr isotopic dating is 104 Ma, and the K-Ar biotite date is about 98 Ma [42,43]. Both large intrusive bodies are accompanied by numerous dikes and veins consisting of granite-aplites, pegmatites, quartz, granite-porphyries, dacitic, andesite-dacitic, and diabase porphyrites.…”

“…The specific Cretaceous endogenous processes resulted in the extensive and diverse group of mineral deposits formed from 145 to 70 Ma along the eastern Asian continental margin from northern Vietnam, through eastern China, Korea, Japan, and to Far East Russia, representing a good example of a regional extensionrelated metallogenic province [47]. The authors of the mentioned studies [42][43][44] do not necessarily share our "galactic" view on the Cretaceous evolution, although their ideas seem close to our ideas, at least, do not contradict them.…”